LUNG FUNCTIONS IN HEALTH AND LUNG FUNCTIONS IN HEALTH AND DISEASEDISEASE

Prof. Sultan Ayoub MeoProf. Sultan Ayoub MeoMBBS, M.Phil, Ph.D (Pak), PG Dip Med Ed MBBS, M.Phil, Ph.D (Pak), PG Dip Med Ed

(Scotland) (Scotland) FRCP (London), FRCP (Dublin), FRCP (Glasgow), FRCP (London), FRCP (Dublin), FRCP (Glasgow),

FRCP (Edinburgh)FRCP (Edinburgh)Professor, Department of Physiology, College of Professor, Department of Physiology, College of

MedicineMedicineKing Khalid University Hospital, King Saud King Khalid University Hospital, King Saud

University Riyadh, Saudi ArabiaUniversity Riyadh, Saudi Arabia

SPIROMETRY

Spirometry is a widely used, effort depended basic lung function test

Assess the lung performance Assess physiological parameters; lung volumes,

capacities & flow rate Differentiate between the obstructive and

restrictive lung conditions Play a critical role in the diagnosis, differentiation

and management of respiratory illness.

Ruppel, Res Care Clin N Am 1997; Pierce William, Aus Fam Phy J , 2005

PHYSIOLOGICAL CONDITIONS AND SPIROMETRY

Physiology conditions:

Age, Gender, Height, Weight

Ethnic group

Exercise

Posture

Pregnancy

Cotes, 1995

Based on clinical features / abnormal lab tests

Symptoms: Dsyponea, cough, phlegm production, chest pain

Signs: Cyanosis, clubbing, chest deformity, diminished chest expansion, diminished breath

sounds

Arterial blood gas analysis: Hypoxemia, hypercapnia

Abnormal chest X Ray:

INDICATIONS OF SPIROMETRY

Cotes, 1995

INDICATIONS OF SPIROMETRY

Occupations settings:

Pre employment

periodic lung function examination for workers exposed to toxic substances including dust and

fumes in industrial sectors such as:

Cement / Asbestoses

Welding / Wood / Steel

Flour / Coal mine / Oil

Meo et al., J Occup Envir Med, 2004Meo et al., Int J Occup Med & Env Health, 2005

Meo et al., Int J Env Health Res 2006Meo et al., Marine pollution Bulletin, 2008

Describe the course of diseases affecting PFTs

Neuromuscular diseases: Gullian Barre Syndrome, Myasthenia gravis

Pulmonary diseases: Obstructive airway diseases, Interstitial lung diseases

Adverse reactions: Drugs with known pulmonary toxicity [Pulmonary fibrosis]

INDICATIONS OF SPIROMETRY

INDICATIONS OF SPIROMETRY

To determine the suitability for and management during and

after anesthesia

To assess the risk for surgical procedures known to affect

lung function

Cotes 1995; ACCP Chest 2003; Regli et al., Anaesthesia, 2006

PRE OPERATIVE INDICATIONS

INDICATIONS OF SPIROMETRY

To assess the therapeutic interventions:

Bronchodilator therapy

Steroid treatment for asthma

Chronic obstructive lung disease

Interstitial lung disease

Monitoring indications

SYMPTOMS

coughcoughsputumsputumdyspneadyspnea

EXPOSURE TO RISKFACTORS

tobaccotobaccooccupationoccupation

indoor/outdoor pollutionindoor/outdoor pollution

SPIROMETRYSPIROMETRY

DIAGNOSIS OF COPD

SPIROMETRY IN RESPIRATORY DISEASES

SMOKERS AND SPIROMETRY

Smoker & Non Smoker:

Non Smoker: In normal healthy non smoker subject after the age of 30 the

expected decline in Lung function parameter [FEV1] is 25–30 ml/ annum

Smoker: The average rate of decline of lung function in smokers as measured by

Forced Expiratory Volume in 1 sec [FEV1] is 60-70 ml / annum

Davis et al., Diabetes Care, 2004

SMOKERS AND SPIROMETRY

y = -0.0308x + 3.6574r=-0.258p=0.04

.00

1.00

2.00

3.00

4.00

5.00

6.00

0 5 10 15 20 25 30 35

Duration (years)

FV

C (

litr

es)

y = -0.0307x + 3.1206r=-0.282p=0.028

.00

.50

1.00

1.50

2.00

2.50

3.00

3.50

4.00

4.50

0 5 10 15 20 25 30 35

Duration (years)

FE

V1 (lit

res

)

IMPAIRED LUNG FUNCTION IN DMIMPAIRED LUNG FUNCTION IN DM

Meo and Al -Rubeaan, Saudi Med J; 2006

y = -0.0626x + 4.0048r=-0.321p=0.014

.00

1.00

2.00

3.00

4.00

5.00

6.00

7.00

8.00

0 5 10 15 20 25 30 35

Duration (years)

FE

F 2

5-75%

y = -0.0849x + 6.5076r=-0.266p=0.035

.00

2.00

4.00

6.00

8.00

10.00

12.00

0 5 10 15 20 25 30 35

Duration (years)

PE

F (

litr

es/s

ec)

Meo and Al Rubeaan, Saudi Med J; 2006

IMPAIRED LUNG FUNCTION IN DMIMPAIRED LUNG FUNCTION IN DM

SPIROMETRY& HbA1c SPIROMETRY& HbA1c

-200

-160

-120

-80

-40

0

403.3-4.8 4.9-5.1 5.2-5.3 5.4-5.6 5.7-15.7

FEV1FVC

HbA1c

(ml)

Increase in mean HbA1c is associated with decrease in lung function parameters FVC & FEV1

Davis et al., Diabetes Care 2004

Mc Keever et al., Am J Epidemiol, 2005

SIROMETRY AND CEMENT SIROMETRY AND CEMENT INDUSTRYINDUSTRY

Lung Function Parameters FVC FEV1

FEF 25-75 % and PEF were significantly

decreased in cement mill workers compared to their matched

controls

Meo et al., Int J Occup Med Environ Health, 2006

SIROMETRY AND WELDING SIROMETRY AND WELDING INDUSTRYINDUSTRY

Lung Function Parameters FVC FEV1

PEF were significantly impaired in welding workers

compared to their matched controls

Meo et al., Am J Occup and Environ Med, 2003

SIROMETRY AND OIL SPILL SIROMETRY AND OIL SPILL YY

Lung Function Parameters FVC, FEV1, and FEF 25-

75% were impaired in subjects exposed to crude

oil spill in sea water

Meo et al., Marine pollution Bulletin, 2008, Meo, et al., Int J Occup Med and

Envirm Health, 2009 0.00

0.50

1.00

1.50

2.00

2.50

3.00

3.50

4.00

4.50

5.00

Mea

n av

earg

e of

diff

rent

lung

func

tion

para

met

ers

FVC (litres) FEV1(litres) FEF25-75 % (litres / sec)

2003 y

2004 y

TAKE HOME MESSAGE

The incidence of respiratory diseases has been

increased, hence the importance of lung function

test can not be ignored

Respiratory assessment through Spirometry may

be mandatory at all the levels of respiratory care /

clinical settings

As we can not treat the patient with high blood pressure without knowing the blood pressure

Similarly, we can not treat the patients with respiratory problems without knowing the lung function test [Spirometry]

TAKE HOME MESSAGE

H

T

N

Y

A O

UK